He's back: YouTube's favourite feline is back in business with a series of cute clips to celebrate his fifth birthday
Naughty: Maru appears in the latest video poking his head through boxes and shopping bags
Popular: Footage of the Japanese cat's antics has been viewed millions of times, and he now has more than 10,000 Facebook fans and 15,000 followers on Twitter
Peek-a-boo: Maru was given some cake, meat, a new toy and a slim box to play in to celebrate his milestone birthday
Interview: Maru, who has his own blog, recently told lovemeow.com: ' Sleep, eat, and play. My hooman always says that I live a life that everybody envies
